PASI s.r.l.

- Model GEA 3 - 24-Bit Real Data Acquisition Seismograph

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Gea3 is a 24-bit real data acquisition seismograph in a waterproof container. GEA3 is a compact-sized 3-channel seismograph with a 24 bit acquisition board with USB interface for external PC (not included). Suitable for Downhole and Crosshole applications, it’s perfect also for small scale seismic refraction and surface waves analysis.

This small, extremely lightweight instrument is equipped with 3 channels+one displayable trigger channel and is the perfect solution for a variety of applications: 

  • DOWN-HOLE seismic measurements with the use of a 3D well geophone (such as PASI Mod.GFA or Mod.DHTG)
  • CROSS-HOLE seismic measurements combined with a 3D well geophone (such as PASI Mod.GFA or Mod.DHTG) and a P/S hole energizer
  • small-scale seismic refraction with surface geophones and 3-channel seismic cable
  • MASW and Vs30 profiles with a special triaxial geophone

Gea3, connected to a computer via USB interface, allows for the acquisition, saving and later data analysis directly from your computer by means of special supplied software.

  • Model : GEA3
  • Number of signals acquired : 3 chs + trigger
  • Data Conversion : 24 real bits A/D Sigma-Delta
  • Sampling frequencies : 20, 100, 200, 500, 1000, 2000, 4000, 8000 Hz
  • Acquisition duration : from 250 ms to 30 minutes
  • Stacking : selectable up to 20 stack
  • Input impedance : 2 MO
  • S/N ratio : max. 117db
  • Passband at +/- 0.1 dB : 108 Hz
  • Passband at - 3dB : 212 Hz
  • Trigger : Trigger sensitivity adjustable
  • Display mode of the traces : wiggle-trace / variable area
  • Noise-monitor : real time 'cascade' display
  • External connection : 1x USB port
  • Automatic calibration : Yes
  • Data format : SEG2, SAF
  • Power supply : trough USB connection
  • Operating temperature : -25°C to +55°C
  • Dimension : 21 cm x 17 cm x 9 cm
  • Weight : > 1 Kg

  • DOWNHOLE (with borehole triaxial geophones Mod.GFA or Mod.DHTG)
  • CROSSHOLE applications (with borehole triaxial geophones Mod.GFA or Mod.DHTG + P/S wave borehole seismic source)
  • Small scale REFRACTION
  • MASW and Vs30 acquisitions with 3D-Land Geophones
  • Foundation studies
  • Evaluation of excavation cost

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  • Borehole 3D Geophones
  • Seismic Cables
  • Horizontal and Vertical Geophones
  • Striking plate for “P and/or “S” waves
  • Seismic Energizer “ISOTTA”
  • Crosshole energizer
  • Starter Geophone
  • Shielded cable for starter geophone/hammer switch
  • Mallet

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